洞庭湖水系(湖南地区)主要防护型经济树种草种生态类型区选择研究

为了减少或避免在农林业生产中因土壤、气候不适宜造成的冻害或其它自然灾害造成的不必要的损失，最大限度地利用洞庭湖水系(湖南地区)区域内的气候资源、水热资源以及土壤资源，本文依据洞庭湖水系(湖南地区)区域内89个样本县(市)气象台(站)30年的气候资料及其地貌、土壤等生态环境特性值，采用主分量(PCA)分析的方法，并结合定性分桥，对洞庭湖水系(湖南地区)进行了生态类型区划分的研究，其结果将该区域划分成5个生态类型区，并结合26个主要经济树种草种分布的气候、水热条件、地貌和土壤等生态环境的差异性，对26个树种草种进行了最适宜、适宜、较适宜栽培的生态类型区的选择研究，相应地对各生态类型区进行了主栽树种和辅栽树种的分析。

Selection of ecological type region for important economic trees and grass in Dongting Rivers (Hunan area)

In agriculture and forestry,losses are often caused by unsuitable soil,climate,or natural disaster,while natural resources are not fully used.Based on data of 30 years' climate information,characteristics of geomorphology,soil,and ecological environment were collected for 89 demonstration counties in Dongting Rivers (Hunan area).Based on the results,5 ecological type regions.In Dongting River (Hunan area) were categorized.The water and temperature conditions,land forms and ecological environment concerning the distribution of 26 species of trees and grass were analyzed.Different suitable region for planting 26 species of trees were identified:the most suitable ecological type regions,more suitable ecological type region,and suitable ecological type region. In each ecological type region, important planting trees and grass were identified.